Hybrid LES-RANS-coupling for complex flows with separation
Publication date
2009
Document type
Book part
Author
Aybay, Orhan
Jaffrézic, Benoit
Visonneau, Michel
Deng, Ganbo
Guilmineau, Emmanuel
Chikhaoui, Oussama
Editor
Brun, Christophe
Juvé, Daniel
Manhart, Michael
Munz, Claus-Dieter
Organisational unit
Scopus ID
ISBN
ISSN
Series or journal
Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Periodical volume
104
Book title
Numerical simulation of turbulent flows and noise generation : results of the DFG/CNRS research groups FOR 507 and FOR 508
First page
201
Last page
229
Part of the university bibliography
✅
Abstract
The investigations carried out within the French-German DFG-CNRS Research Initiative on 'LES of Complex Flows (FOR 507)' aimed at the development and application of hybrid LES-RANS methods for turbulent flows with separation. The objectives were twofold.On the one hand, the performance of a well-established hybrid approach, namely the detached-eddy simulation, was studied based on really challenging test cases such as the flow over the 3D hill and around the Willy car model. On the other hand, a new hybrid LES-RANS methodologywas set up which aims at overcoming certain drawbacks associated with DES. It relies on the coupling of a near-wall RANS model with LES for the outer flow which allows an appropriate representation of large-scale flow phenomena. In order to take the anisotropies in the near-wall region rigorously into account, an explicit algebraic Reynolds stress model was chosen and its performance in comparison with linear eddy-viscosity models was analyzed for different test cases such as the flow over 2D hills and in a 3D diffuser. A further advantage of the new hybrid method is that no interface predefinition is required. Instead the interface is dynamically determined on-the-fly based on instantaneous physical quantities which guarantees that local changes in the flow are accounted for. © 2009 Springer-Verlag Berlin Heidelberg.
Cite as
In: Numerical simulation of turbulent flows and noise generation / Brun, Christophe. - Berlin : Springer, 2009 . - 2009, Seite 201-229
Version
Not applicable (or unknown)
Access right on openHSU
Metadata only access